Something

#define __STEP__ 10

int getInput(char **ppTest)
{
  int length = 0;
  int input = 0;
  *ppTest = (char*)malloc(__STEP__+1);
  if (!(ppTest))
    return 0;
  while((input = fgetc(stdin)) != EOF)
  {
    if ( (__STEP__-1)==(length%__STEP__))
      {
        if (NULL==realloc((*ppTest), length+1+__STEP__+1))
          {
            free(*ppTest);*ppTest=NULL;
            return 0;
          }
      }
    (*ppTest)[length] = (char)input;
    ++length;
  }
  (*ppTest)[length] = '\0';
  return length;
}

int main (int argc, char *argv[])
  {
    char *pText=NULL;
    int iText_Lg=0;
    if (0!=argc)
      argv[0]=argv[0];

    iText_Lg=getInput(&pText);
    printf("\n res : %s\n", pText);
    if (pText)
      free(pText);
    return 0;
  }